/** {@inheritDoc} */
public void removeHostListener(HostListener listener) {
/*
* XXX: if a disconnect method is added, make sure it calls
* this method to unregister this object from the watcher. otherwise,
* an unused MonitoredHostProvider instance may go uncollected.
*/
synchronized (listeners) {
listeners.remove(listener);
if (listeners.isEmpty() && (task != null)) {
task.cancel();
task = null;
}
}
}
/** Fire hostDisconnectEvent events. */
void fireDisconnectedEvents() {
ArrayList registered = null;
HostEvent ev = null;
synchronized (listeners) {
registered = (ArrayList) listeners.clone();
}
for (Iterator i = registered.iterator(); i.hasNext(); /* empty */ ) {
HostListener l = (HostListener) i.next();
if (ev == null) {
ev = new HostEvent(this);
}
l.disconnected(ev);
}
}
/**
* Fire VmStatusChangeEvent events to HostListener objects
*
* @param active Set of Integer objects containing the local Vm Identifiers of the active JVMs
* @param started Set of Integer objects containing the local Vm Identifiers of new JVMs started
* since last interval.
* @param terminated Set of Integer objects containing the local Vm Identifiers of terminated JVMs
* since last interval.
*/
private void fireVmStatusChangedEvents(Set active, Set started, Set terminated) {
ArrayList registered = null;
VmStatusChangeEvent ev = null;
synchronized (listeners) {
registered = (ArrayList) listeners.clone();
}
for (Iterator i = registered.iterator(); i.hasNext(); /* empty */ ) {
HostListener l = (HostListener) i.next();
if (ev == null) {
ev = new VmStatusChangeEvent(this, active, started, terminated);
}
l.vmStatusChanged(ev);
}
}
/** {@inheritDoc} */
public void addHostListener(HostListener listener) {
synchronized (listeners) {
listeners.add(listener);
if (task == null) {
task = new NotifierTask();
timer.schedule(task, 0, interval);
}
}
}